TeraConvertTeraConvert

Convert MKV to MP4 on your Mac

macOS and QuickTime won't open MKV. Convert MKV to MP4 on your Mac so it plays everywhere, with nothing uploaded. The desktop app batches entire folders.

Conversion Successful
100% local. Your file is processed in this tab and never uploaded.

How to Convert MKV to MP4

  1. 1

    Drop your MKV file

    Drag it into the converter above, or click to browse. Nothing is uploaded.

  2. 2

    Adjust settings (optional)

    Trim, crop, resize, mute, or set quality from the sliders icon.

  3. 3

    Convert and download

    MP4 is preselected. The file converts in this tab and downloads when done.

Why Convert MKV to MP4?

MKV is a popular container for high-quality video with multiple subtitle and audio tracks, but it does not play on most smart TVs, iOS devices, PlayStation, or streaming services without a dedicated media app.

Converting to MP4 creates a broadly compatible file that plays natively on every device.

MKV
MP4
Container
Matroska (MKV)
Container
MP4 (ISOBMFF)
Typical codec
H.264 / H.265 / AV1
Typical codec
H.264 / H.265
Audio codec
AAC / AC3 / DTS / FLAC
Audio codec
AAC
Streaming friendly
No
Streaming friendly
Yes
Device support
PC media players, limited TVs
Device support
Universal
Typical use
HD/4K video archives
Typical use
Web, mobile, TV

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Frequently Asked Questions

My MKV has multiple audio tracks. Which is extracted?
The default audio track (usually track 1). Per-track selection is not exposed yet.
Will my MKV subtitles transfer to the MP4?
No. Subtitle tracks are dropped during conversion; keep the original MKV if you need them.
My MKV uses H.265 (HEVC). Will the MP4 also be H.265?
The output targets H.264 for maximum compatibility. H.265 sources are re-encoded to H.264, which may slightly increase file size at the same visual quality.
Can I convert a 1080p or 4K MKV file?
Yes. The browser tool supports files up to 500 MB. For large 4K MKV files (often 20-40 GB), TeraConvert Desktop converts them natively with no size cap.
Is my file private?
Yes. The conversion runs in your browser tab and nothing is uploaded, so your files never leave your device. The only limit is size: 500 MB for this format. Bigger files route to the desktop app.

Converting a large MKV media library?

TeraConvert Desktop converts MKV files of any size through native FFmpeg, batch included.

Get TeraConvert for MacThis format runs in the Mac app. One-time Pro purchase, 14-day money-back guarantee.